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If your Maine home still runs on R-22, that refrigerant has been banned since 2020. R-410A is phasing out next. Every new heat pump now uses R-32 or R-454B — and Efficiency Maine offers $1,000-$3,000 per unit to help you upgrade.
Last updated March 2026
2026 Update: The federal 25C heat pump tax credit expired December 31, 2025. There is no federal tax credit for heat pumps in 2026. Efficiency Maine rebates remain available at $1,000-$3,000 per unit. Current Maine heat pump rebates
Maine homeowners are affected by two separate refrigerant phase-outs. R-22 is already banned. R-410A is being phased down under the EPA AIM Act. Here is the full timeline.
Affects: R-22
No new R-22 systems. Existing systems rely on reclaimed supply.
Affects: R-410A
Manufacturers transition new product lines to R-32 and R-454B.
Affects: R-32 / R-454B
All new heat pumps sold use low-GWP refrigerants. R-410A still available for service.
Affects: All HFCs
R-410A service costs expected to rise. Upgrading becomes more cost-effective.
Production and import banned since January 1, 2020
Ozone-depleting substance (Montreal Protocol)
Only reclaimed/recycled supply available — $75-$150/lb
Common in AC systems installed before 2010
If your system uses R-22, upgrading saves thousands long-term
GWP of 2,088 — each pound traps 2,088x more heat than CO2
EPA AIM Act mandates 40% HFC reduction by 2028
Manufacturers have stopped producing new R-410A equipment
Service refrigerant still available but prices rising
Systems installed 2010-2024 typically use R-410A
Bottom line: If you are buying a new heat pump in 2026, it will use R-32 or R-454B. If you already have an R-410A or R-22 system, nothing changes immediately — but upgrading sooner saves you from rising refrigerant costs and qualifies for Efficiency Maine rebates.
Four refrigerants Maine homeowners encounter. Two are being eliminated. Two are the approved replacements that qualify for Efficiency Maine rebates.
GWP
1,810
Very High
Safety
A1 (Non-flammable)
Status
Production banned since 2020
Ozone-depleting. Only reclaimed supply available.
GWP
2,088
Very High
Safety
A1 (Non-flammable)
Status
No longer in new equipment
Service refrigerant still available. Prices rising.
GWP
675
Medium
Safety
A2L (Mildly flammable)
Status
Current standard — ductless
Brands
Mitsubishi, Fujitsu, LG, Daikin
Dominant in mini-split systems. Used globally since 2013.
GWP
466
Low
Safety
A2L (Mildly flammable)
Status
Current standard — ducted
Brands
Carrier, Lennox, Trane, Bosch
Lowest GWP option. Near drop-in for R-410A ducted systems.
Higher energy efficiency in many applications
Lower refrigerant charge needed per system
Dominant in ductless mini-split systems — ideal for room-by-room heating
Proven track record — used globally since 2013
Lower GWP (466 vs 675) — best for climate impact
Near drop-in replacement for existing R-410A ductwork
Dominant in ducted central heat pump systems
Lower operating pressure reduces component stress
Over 60% of Maine homes heat with oil — the highest rate in the nation. The refrigerant phase-out is the perfect time to make the switch. Here is why.
$3.82
per gallon (early 2026)
A typical Maine home burns 800-1,200 gallons per winter, costing $3,000-$4,500 annually. Heat pumps cut that by 30-50%.
Even at Maine electric rates, a cold-climate heat pump delivers 2-3x more heat energy per dollar than oil.
Up to 3 units per home. Covers R-32 and R-454B models.
The math: A family switching from oil to 3 heat pump units with Efficiency Maine rebates can save $1,500-$2,500 per year on heating while getting $3,000-$9,000 in rebates. The refrigerant in your new system will be R-32 or R-454B — cleaner, more efficient, and future-proof.
Full oil vs heat pump comparisonMaine's Climate Zones 5 and 6 demand cold-climate-certified equipment. Here are the top models available with next-gen refrigerants and their minimum operating temperatures.
Zone 5 (southern Maine, Portland): design temp around -1F. Zone 6 (northern Maine, Caribou): design temp around -18F. Cold-climate certification is essential.
| Brand | Model | Refrigerant | Type | Min Temp | Cold Climate |
|---|---|---|---|---|---|
| Mitsubishi | Hyper-Heat (H2i) | R-32 | Ductless / Ducted Mini-Split | -13F | |
| Fujitsu | XLTH Series | R-32 | Ductless Mini-Split | -15F | |
| LG | Red Series | R-32 | Ductless / Multi-Zone | -13F | |
| Daikin | FIT / Altherma | R-32 | Ducted / Air-to-Water | -13F | |
| Carrier | Greenspeed | R-454B | Ducted Central | -10F | |
| Bosch | IDS 2.0 | R-454B | Ducted Central | -13F | |
| Lennox | XP25 | R-454B | Ducted Central | 0F | Standard |
| Trane | XV20i | R-454B | Ducted Central | 0F | Standard |
Hyper-Heat (H2i)
Ductless / Ducted Mini-Split
XLTH Series
Ductless Mini-Split
Red Series
Ductless / Multi-Zone
FIT / Altherma
Ducted / Air-to-Water
Greenspeed
Ducted Central
IDS 2.0
Ducted Central
XP25
Ducted Central
XV20i
Ducted Central
Maine recommendation: For northern Maine (Zone 6), prioritize models rated to -13F or below: Mitsubishi Hyper-Heat (R-32), Fujitsu XLTH (R-32), or Bosch IDS 2.0 (R-454B). Southern Maine (Zone 5) has more flexibility — all cold-climate-rated models perform well. Full cold-climate guide
The refrigerant transition does not significantly change what you pay for a new heat pump. The real cost difference is for homeowners still servicing old R-22 systems.
No significant change
R-32 and R-454B models priced similarly to former R-410A models
Newer models have higher efficiency ratings, providing better value
Efficiency Maine rebates $1,000-$3,000/unit apply to both refrigerants
Minimal change
Technicians need A2L certification — increasingly common in ME
Installation process is nearly identical to R-410A systems
Same labor time, slightly different brazing procedures
Costs increasing yearly
R-22 recharge: $75-$150 per pound (reclaimed only)
A 5-lb recharge can cost $375-$750 vs $100-$200 five years ago
Upgrading to a new system eliminates this recurring expense
Both R-32 and R-454B are classified as A2L — "mildly flammable." This sounds concerning but is well understood and safely managed.
Requires a high-energy ignition source — cannot ignite from a match or lighter
Flame propagation is very slow compared to highly flammable substances
Normal residential use never approaches flammable concentrations
R-32 and R-454B are less flammable than propane (used in millions of grills)
A2L classification has been safely used in Japan and Europe for 10+ years
Refrigerant leak detection sensors in every indoor unit
Automatic shutoff valves that close if a leak is detected
Self-diagnostic systems that alert homeowners and technicians
Ventilation controls that activate automatically during a leak event
UL-certified safety testing exceeds residential use requirements
No special requirements for homeowners. You do not need additional ventilation, special detectors, or modifications to your home. The safety features are built into the equipment. Millions of homes worldwide have used A2L refrigerant systems for over a decade with an excellent safety record.
Check your outdoor unit label
Look for a sticker showing "R-22" or "HCFC-22." Systems installed before 2010 likely use R-22.
Get a heat pump quote now
R-22 recharge costs are climbing every year. A new heat pump pays for itself faster than continued R-22 top-ups.
Claim Efficiency Maine rebates
$1,000-$3,000 per unit, up to 3 units. Your new system uses R-32 or R-454B.
No immediate action needed
Your R-410A system works fine. Continue using it normally for the rest of its 15-20 year lifespan.
Service is still available
R-410A refrigerant remains available for recharges and repairs. Costs may rise gradually.
Plan for eventual replacement
When your system reaches end of life, the replacement will use R-32 or R-454B automatically.
Watch for leaks: If your R-22 or R-410A system frequently needs recharges, that indicates a refrigerant leak. Repeated recharges waste money — especially at R-22 prices. It often makes more financial sense to replace the system and claim Efficiency Maine rebates.
R-22 production and import was banned nationwide in 2020 under the EPA Clean Air Act. You can still use your existing R-22 system, but refills rely on reclaimed or recycled refrigerant, which costs $75-$150 per pound and rising. If your system needs frequent recharges, upgrading to a modern heat pump with R-32 or R-454B is far more cost-effective.
R-410A is not outright banned, but manufacturers have stopped producing new R-410A equipment. The EPA AIM Act mandates a nationwide phase-down of high-GWP refrigerants. All major heat pump brands now ship R-32 or R-454B models. R-410A refrigerant remains available for servicing existing systems.
Yes. Both carry an A2L safety classification, meaning they are mildly flammable only under very specific conditions requiring a high-energy ignition source. Modern heat pumps include built-in leak detection sensors, automatic shutoff valves, and ventilation controls. Millions of homes worldwide use A2L refrigerant systems safely.
Both R-32 and R-454B work well in Maine winters when paired with cold-climate-certified equipment. R-32 ductless models like the Mitsubishi Hyper-Heat operate down to -13F. R-454B ducted models like the Bosch IDS 2.0 also handle extreme cold. The choice depends on whether you want ductless (R-32) or ducted (R-454B), not the refrigerant itself.
No. Your existing R-410A heat pump will work for the rest of its useful life, typically 15 to 20 years. R-410A refrigerant remains available for servicing. When your system eventually needs replacement, the new unit will use R-32 or R-454B.
Yes. Efficiency Maine offers $1,000 per unit (standard income), $2,000 per unit (moderate income), or $3,000 per unit (low income) for new heat pump installations, up to 3 units. These rebates apply to all qualifying heat pumps regardless of what system you are replacing. Switching from an R-22 system to a modern heat pump is one of the best upgrades you can make.
Equipment pricing for R-32 and R-454B models is comparable to what R-410A models cost. The higher efficiency of newer models often offsets any marginal difference. Installation and service costs are similar. In contrast, R-22 recharges now cost $75-$150 per pound due to limited supply.
The federal 25C energy efficiency tax credit expired on December 31, 2025. There is no federal tax credit available for heat pumps purchased in 2026, regardless of which refrigerant they use. Focus on Efficiency Maine rebates for financial incentives.
Absolutely. Over 60% of Maine homes heat with oil. Switching from oil to a cold-climate heat pump reduces heating costs by 30-50% and eliminates your dependence on volatile oil prices ($3.82/gallon as of early 2026). The refrigerant transition means every new system uses cleaner, more efficient R-32 or R-454B technology. Efficiency Maine rebates of $1,000-$3,000 per unit help offset the cost.
Every heat pump we install uses R-32 or R-454B — cold-climate certified for Maine winters. We handle the Efficiency Maine rebate paperwork and ensure proper A2L installation.
Full pricing breakdown by brand and system type for Maine installations.
Read moreComplete guide to $1,000-$3,000 per unit rebates and income-eligible tiers.
Read moreWhich models perform best in Zone 5-6 Maine winters? Brand and sizing guide.
Read moreSide-by-side cost comparison for Maine oil-heated homes switching to heat pumps.
Read moreRefrigerant data: EPA AIM Act final rule, ASHRAE 34 safety classifications.
R-22 phase-out: EPA Clean Air Act, Section 608 regulations.
GWP values: IPCC Fifth Assessment Report (AR5) 100-year values.
Efficiency Maine: Current rebate schedule, efficiencymaine.com, March 2026.
Maine energy data: EIA state energy profiles, oil and electricity pricing.
Equipment models: Manufacturer specification sheets, January-March 2026.